Toothbrush



FIG. 1 is a front elevation view of my design for a toothbrush;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof, the right side being a mirror image thereof;

FIG. 4 is a front elevation view of a second embodiment of my design for a toothbrush, the shading denoting color;

FIG. 5 is a is a rear view thereof; and,

FIG. 6 is a left side view thereof, the right side being a mirror image thereof. 

The ornamental design for a toothbrush, as shown and described. 